So I had a 180 L tank with two 45mm (1.75in) holes for the overflow box outtakes. I upgraded to a 343 L tank and the person who cut the holes made them 51mm (2in) despite me giving him the overflow box to use as a measurement. I have two bulkheads from the old tank, 32mm (approx 1 1/4in) inside diameter, 40mm (approx 1 1/2in) outside diameter plus rubber gaskets, measurements below. What is the best way of getting this stuff to fit together now? Pictures of the fittings: http://www.facebook.com/photo.php?pi...&ref=fbx_album http://www.facebook.com/photo.php?pi...&ref=fbx_album Approximate measurements are (diameter): Tank holes - 51mm Overflow box holes - 45mm Pipes outside diameter - 40mm Pipes inside diameter - 32mm Small gasket inside: 40mm Small gasket outside: ~54mm Large gasket inside: 40mm Large gasket outside: ~60mm Silicone? Replacement gaskets? Replacement bulkheads? If so, what sizes - I am useless at this kind of thing :/ Thanks! Katy.